Actions of Muscles
Terms
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- orbicularis oris
- compresses, purses lips
- orbicularis oculi
- closes eye
- masseter
- elevates mandible and closes jaw
- trapezius
- elevate, retract, depress, or rotate upward of the scapula
- sternocleidomastoid
- together they flex the neck. alone: one side bends neck toward shoulder and turns face to opposide side
- deltoid
- abduction of the shoulder
- pectoralis major
- flexion, adduction, medial rotation at shoulder
- external intercostals
- elevate ribs
- internal intercostals
- depress ribs
- latissimus dorsi
- extension, adduction, medial rotation at shoulder
- biceps brachii
- flexion of elbow
- triceps brachii
- extension of elbow
- pronator teres
- pronates forearm and hand by medial rotation of radius at radioulnar joint
- supinator
- supinates forearm and hand by lateral rotation of radius at radioulnar joint
- external oblique
- compresses abdomen, depresses ribs, flexes or rotates vertebral column to the opposide side
- internal oblique
- compresses abdomen, depresses ribs, flexes or rotates vertebral column to the same side
- rectus abdominis
- compresses abdomen, depresses ribs, flexes vertebral column
- transverse abdominis
- compresses abdomen
- gluteus maximus
- extension and lateral rotation at the hip
- gluteus medius
- abduction and medial rotation at the hip
- tensor fascia latae
- flexion and medial rotation at the hip
- hamstring
- flexion at the knee, extension at the hip
- quadriceps
- extension at the knee, flexion at the hip
- sartorius
- flexion at knee, flexion and lateral rotation at hip
- gracilis
- adduction and medial rotation at hip
- adductor longus
- adduction and medial rotation at hip
- gastrocnemius
- plantarflexion
- tibialis anterior
- dorsiflexion